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Category:   Application (Generic)  >   Enterasys NetSight Vendors:   Enterasys Networks, Inc.
Enterasys NetSight nssyslogd Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1026440
SecurityTracker URL:
CVE Reference:   CVE-2011-5227   (Links to External Site)
Updated:  Oct 26 2012
Original Entry Date:  Dec 20 2011
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Network Management Suite prior to
Description:   A vulnerability was reported in Enterasys NetSight. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted data to UDP port 514 to trigger a buffer overflow in 'nssyslogd.exe' and execute arbitrary code on the target system. The code will run with System privileges.

The vendor was notified on April 27, 2011.

Jeremy Brown and Andrea Micalizzi aka rgod reported this vulnerability via TippingPoint's Zero Day Initiative.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fix (Network Management Suite (NMS)

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise), Linux (SuSE), Windows (Any)

Message History:   None.

 Source Message Contents

Date:  Mon, 19 Dec 2011 15:01:43 -0600
Subject:  ZDI-11-350 : Enterasys NetSight nssyslogd PRI Remote Code Execution Vulnerability

Hash: SHA1

ZDI-11-350 : Enterasys NetSight nssyslogd PRI Remote Code Execution
December 19, 2011

- -- CVE ID:

- -- CVSS:
10, AV:N/AC:L/Au:N/C:C/I:C/A:C

- -- Affected Vendors:


- -- Affected Products:

Enterasys NetSight

- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11871.
For further product information on the TippingPoint IPS, visit:

- -- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Enterasys Netsight. Authentication is not
required to exploit this vulnerability.

The flaw exists within the nssyslogd.exe component which listens by
default on UDP port 514. When parsing a new syslog message the process
attempts to copy the PRIO field to an intermediate variable. The process
does not properly validate the size of the destination buffer and
blindly copies user supplied data into a fixed-length buffer on the
stack. A remote attacker can exploit this vulnerability to execute
arbitrary code under the context of the SYSTEM user.

- -- Vendor Response:

Enterasys has issued an update to correct this vulnerability. More
details can be found at:

- -- Disclosure Timeline:
2011-04-27 - Vulnerability reported to vendor
2011-12-19 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Jeremy Brown

* Andrea Micalizzi aka rgod

- -- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

Follow the ZDI on Twitter:
Version: GnuPG v2.0.17 (MingW32)


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